BEGIN:VCALENDAR VERSION:2.0 PRODID:-//geodesy.science - IAG website - ECPv6.15.18//NONSGML v1.0//EN CALSCALE:GREGORIAN METHOD:PUBLISH X-WR-CALNAME:geodesy.science - IAG website X-ORIGINAL-URL:https://geodesy.science X-WR-CALDESC:Events for geodesy.science - IAG website REFRESH-INTERVAL;VALUE=DURATION:PT1H X-Robots-Tag:noindex X-PUBLISHED-TTL:PT1H BEGIN:VTIMEZONE TZID:UTC BEGIN:STANDARD TZOFFSETFROM:+0000 TZOFFSETTO:+0000 TZNAME:UTC DTSTART:20200101T000000 END:STANDARD END:VTIMEZONE BEGIN:VTIMEZONE TZID:UTC BEGIN:STANDARD TZOFFSETFROM:+0000 TZOFFSETTO:+0000 TZNAME:UTC DTSTART:20220101T000000 END:STANDARD END:VTIMEZONE BEGIN:VTIMEZONE TZID:Europe/Helsinki BEGIN:DAYLIGHT TZOFFSETFROM:+0200 TZOFFSETTO:+0300 TZNAME:EEST DTSTART:20210328T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0300 TZOFFSETTO:+0200 TZNAME:EET DTSTART:20211031T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0200 TZOFFSETTO:+0300 TZNAME:EEST DTSTART:20220327T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0300 TZOFFSETTO:+0200 TZNAME:EET DTSTART:20221030T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0200 TZOFFSETTO:+0300 TZNAME:EEST DTSTART:20230326T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0300 TZOFFSETTO:+0200 TZNAME:EET DTSTART:20231029T010000 END:STANDARD BEGIN:DAYLIGHT TZOFFSETFROM:+0200 TZOFFSETTO:+0300 TZNAME:EEST DTSTART:20240331T010000 END:DAYLIGHT BEGIN:STANDARD TZOFFSETFROM:+0300 TZOFFSETTO:+0200 TZNAME:EET DTSTART:20241027T010000 END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTART;VALUE=DATE:20230424 DTEND;VALUE=DATE:20230429 DTSTAMP:20260405T170207 CREATED:20220627T073222Z LAST-MODIFIED:20220627T073222Z UID:25524-1682294400-1682726399@geodesy.science SUMMARY:EGU General Assembly 2023 - GGOS Session DESCRIPTION:The EGU General Assembly 2023 brings together geoscientists from all over the world to one meeting covering all disciplines of the Earth\, planetary\, and space sciences. The EGU aims to provide a forum where scientists\, especially early career researchers\, can present their work and discuss their ideas with experts in all fields of geoscience. \nGGOS has as usual its own session there: “Geodesy for Sustainable Earth Observation“ https://meetingorganizer.copernicus.org/EGU23/session/46215. Please submit an abstract to our session until January 10\, 2023 (13:00 CET).\n \nPlease also visit the official EGU website: https://egu23.eu/ \n  URL:https://geodesy.science/event/egu-general-assembly-2023-ggos-session/ CATEGORIES:GGOS,🌐 Other ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/conference_egu.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20230423 DTEND;VALUE=DATE:20230430 DTSTAMP:20260405T170207 CREATED:20250305T062103Z LAST-MODIFIED:20250305T062319Z UID:25573-1682208000-1682726400@geodesy.science SUMMARY:EGU General Assembly 2023 DESCRIPTION: URL:https://geodesy.science/event/egu-general-assembly-2023/ LOCATION:Vienna\, AT\, Vienna\, Austria CATEGORIES:🌐 Other ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/633a9c314b9e0.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Helsinki:20230422T140000 DTEND;TZID=Europe/Helsinki:20230422T180000 DTSTAMP:20260405T170207 CREATED:20230124T143650Z LAST-MODIFIED:20260210T071219Z UID:25530-1682172000-1682186400@geodesy.science SUMMARY:GGOS Coordinating Board Meeting 2023 DESCRIPTION:This GGOS Coordinating Board Meeting was held directly before the EGU General Assembly conference week as a hybried meeting on \nDate: Saturday\, April 22\, 2023 \nTime: 14:00-18:00 MESZ (UTC+2)\n \nVenue: TU Vienna\n \nParticipants: GGOS Coordinating Board members and invited people only! \nReport/Minutes: Minutes_GGOS_CB_meeting_2023_final.pdf \nPresentations: GGOS Cloud URL:https://geodesy.science/event/cb-meeting-2023/ CATEGORIES:GGOS ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/pexels-anton-uniqueton-5986115.jpg ORGANIZER;CN="GGOS Coordinating Office":MAILTO:co@ggos.org END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20230328 DTEND;VALUE=DATE:20230331 DTSTAMP:20260405T170207 CREATED:20221202T092026Z LAST-MODIFIED:20250408T034646Z UID:25528-1679961600-1680220799@geodesy.science SUMMARY:2nd Workshop of Inter-Commission Committee on Geodesy for Climate Research (ICCC) DESCRIPTION:The second workshop of the Inter-Commission Committee on Geodesy for Climate Research (ICCC) of the International Association of Geodesy (IAG) will take place on \nMarch 28-30\, 2023 \nas an online event. The participation is free of charge. \nPlease find more information at the official website: URL:https://geodesy.science/event/2nd-workshop-of-inter-commission-committee-on-geodesy-for-climate-research-iccc/ CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/pexels-pixabay-60013.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20230313 DTEND;VALUE=DATE:20230315 DTSTAMP:20260405T170207 CREATED:20230118T133723Z LAST-MODIFIED:20230118T133723Z UID:25529-1678665600-1678838399@geodesy.science SUMMARY:Workshop in SAR for Geodesy DESCRIPTION:You are warmly welcome to the Workshop in SAR for Geodesy organized at Otaniemi\, Espoo\, Finland and in Zoom 13. –14.3.2023 \nWe will discuss the opportunities and challenges of using the Synthetic Aperture Radar (SAR) technique for geodetic research and applications. We welcome contributions that discuss the uses of the SAR technique for absolute or relative positioning\, opportunities that are emerging in the combination of techniques\, share current status of infra-structure\, or anything else related to the topic. Our invited speakers include Ramon Hanssen (TU Delft)\, Thomas Gruber (TU Munich)\, Muriel Pinheiro(ESA) and Christoph Gisinger(DLR). \nFor more information and registration please visit: \nhttps://www.aalto.fi/en/events/workshop-in-sar-for-geodesy URL:https://geodesy.science/event/workshop-in-sar-for-geodesy/ CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/A.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20221212T080000 DTEND;TZID=UTC:20221216T170000 DTSTAMP:20260405T170207 CREATED:20220627T073624Z LAST-MODIFIED:20250408T040616Z UID:25525-1670832000-1671210000@geodesy.science SUMMARY:AGU Fall Meeting 2022 - GGOS Session DESCRIPTION:AGU Fall Meeting 2022 will be held in Chicago and online everywhere 12 – 16 December 2022. More than 25\,000 attendees from more than 100 countries will convene to explore how Science Leads the Future. \n \nGeodesy for Sustainable Earth Observation\nGGOS has its own session “Geodesy for Sustainable Earth Observation”\, please participate: \nThe Global Geodetic Observing System (GGOS) provides measurements of the gravity\, rotation\, and shape of the Earth using space and terrestrial geodetic techniques. These measurements must be accurate to better than a part per billion in order to advance our understanding of the underlying processes responsible for temporal changes in the Earth’s rotation\, gravity\, and shape. Demanding applications of geodesy include mass transport in the global water cycle\, sea level and climate change\, and crustal deformation associated with geohazards. All these measurements require a common reference with the same precision\, like the terrestrial reference frame and the unified height system. GGOS is designed to unite the individual observations and model into one consistent frame with the highest precision available. This session welcomes contributions on topics relevant to GGOS\, particularly those related to its scientific and social aspects\, geodetic infrastructure\, observations/products\, and activities of services. \nFor more information and the program of all geodesy sessions\, please visit https://agu.confex.com/agu/fm22/meetingapp.cgi/Program/3397 \n  URL:https://geodesy.science/event/agu-fall-meeting-2022-ggos-session/ LOCATION:McCormick Place Convention Center – Chicago\, IL\, 2301 S King Dr\, Chicago\, IL\, 60616\, United States CATEGORIES:GGOS,🌐 Other ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/AGU_conference.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=Europe/Helsinki:20221114T083000 DTEND;TZID=Europe/Helsinki:20221115T173000 DTSTAMP:20260405T170207 CREATED:20210727T075806Z LAST-MODIFIED:20260210T071253Z UID:25502-1668414600-1668533400@geodesy.science SUMMARY:GGOS Days 2022 DESCRIPTION:GGOS organized the annual GGOS Days in the year 2022 at November 14-15 in Munich (Germany) as a hybrid meeting at the Bavarian Academy of Science and Humanities (BAdW) in the Residenz. GGOS Days is the annual meeting of GGOS to report on recent activities and present plans for the coming year. In total 111 interested people participated in this conference. 33 of them in-person and 78 virtually. \nDownload Documents\nPresentation Slides: at Zenodo Platforms with DOI’s (or at GGOS Cloud) \nPhotos of the Conference: https://cloud.ggos.org/index.php/s/SGaW7fiXM3gCZtT \nVideos – Recording of whole Conference at YouTube – GGOS Days 2022 Playlist \nGGOS Days Minutes (DOI: 10.5281/zenodo.7377449) \n \nSchedule\nThe detailed schedule will follow… \nVideo\nThe whole GGOS Days conference was recorded and is available at YouTube: GGOS Days 2022 Playlist \n\n\nMeeting Organization \nChair: Basara Miyahara \nLocal Organizer: Detlef Angermann\, Urs Hugentobler\, Laura Sánchez\, Michael Schmidt\, Felix Müller\, Stefanie Daurer\, Julia Schießl \nGGOS Organizer: Martin Sehnal\, Basara Miyahara\, Detlef Angermann\, Mike Pearlman\, Laura Sánchez URL:https://geodesy.science/event/ggos-days-2022/ CATEGORIES:GGOS ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/Background.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20221107 DTEND;VALUE=DATE:20221112 DTSTAMP:20260405T170207 CREATED:20210901T044334Z LAST-MODIFIED:20210901T044334Z UID:25507-1667779200-1668211199@geodesy.science SUMMARY:22nd International Workshop on Laser Ranging DESCRIPTION:Yebes Observatory\, the National Geographic Institute of Spain (IGN)\, with the support of National Centre for Geographic Information (CNIG)\, and in collaboration with the International Laser Ranging Service (ILRS)\, will host the 22nd International Workshop on Laser Ranging in Guadalajara\, Spain\, on November 7-11\, 2022. \nThe city of Guadalajara\, in Castilla-La Mancha\, the region roamed by Cervantes’ immortal character Don Quixote\, is conveniently located some 60 km eastwards of Madrid\, easily reachable by public transport. It is the largest population centre near the Yebes Observatory\, the most significant Spanish facility in the fields of radio astronomy and geodesy. The conference venue\, where the main program and meetings of the various ILRS Standing Committees will be held\, is located near the city centre\, with accommodation and services at walking distance. \nAfter the hiatus caused by the COVID-19 pandemic\, the 22nd IWLR\, organized as a hybrid in-person/online event\, will be an excellent opportunity to show and discuss advances in the scientific and technological fields of Satellite Laser Ranging\, Lunar Laser Ranging\, and other related techniques. URL:https://geodesy.science/event/22nd-international-workshop-on-laser-ranging/ LOCATION:Guadalajara\, Spain\, Guadalajara\, Spain CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/slr-laser_ranging-mmexport1516692870714.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20221021 DTEND;VALUE=DATE:20221024 DTSTAMP:20260405T170207 CREATED:20210727T055415Z LAST-MODIFIED:20251001T110207Z UID:25501-1666310400-1666569599@geodesy.science SUMMARY:Unified Analysis Workshop (UAW) 2022 DESCRIPTION:The Unified Analysis Workshop (UAW) 2022 was hold on October 21-23\, 2022 in Thessaloniki\, Greece after the REFAG 2022 Symposium as a hybried meeting. It was co-organized by the IAG’s Global Geodetic Observing System (GGOS) and the International Earth Rotation and Reference Systems Service (IERS) for the purpose of discussing issues that are common to all the space-geodetic measurement techniques. \nAll Photos of UAW are available here \nPresentations\nYou can find all uploaded presentations at Zenodo: https://zenodo.org/communities/uaw2022 \n  \n\nProgram – Schedule\nDownload the full UAW2022 Program here … \n  \nScientific Organizing Committee (SOC):\nThe SOC consits of the main organizers\, the Local Organizing Committee (LOC) and the chairs/co-chairs of the sessions. \nOrganizer:\nBasara Miyahara (GGOS) \nRobert Heinkelmann (IERS) \nZuheir Altamimi (IAG) \nMartin Sehnal (GGOS Coordinating Office) \nLocal Organizing Committee (LOC):\nChristopher Kotsakis \n  URL:https://geodesy.science/event/unified-analysis-workshop-uaw-2022/ LOCATION:Electra Palace – Thessaloniki\, Greece\, Aristotelous 9\, Thessaloniki\, Greece CATEGORIES:GGOS,IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/UAW2022_CoverWebsiteGGOS.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20221017 DTEND;VALUE=DATE:20221021 DTSTAMP:20260405T170207 CREATED:20210903T042447Z LAST-MODIFIED:20250319T123130Z UID:25516-1665964800-1666310399@geodesy.science SUMMARY:REFAG 2022 - IAG International Symposium on Reference Frames for Applications in Geosciences DESCRIPTION:The IAG International Symposium on Reference Frames for Applications in Geosciences (REFAG 2022) is organized by the Aristotle University of Thessaloniki\, under the scientific coordination of Commission 1 of the International Association of Geodesy (IAG). The symposium will be held in Thessaloniki\, Greece on October 17-20\, 2022. \nREFAG 2022 carries on the tradition of previous IAG dedicated symposia on Reference Frames (Munich 2006\, Marne-la-Vallee 2010\, Luxemburg 2014\, Pasadena 2018)\, aiming to bring together leading experts from academia\, public authorities and private sector with young scientists\, to discuss current achievements and future challenges of geodetic reference frames and their scientific and societal impact. \nThe primary scope of REFAG 2022 is to address today’s theoretical concepts of reference systems and their practical implementation by space geodetic techniques and their combinations\, underlying limiting factors\, systematic errors and novel approaches for future improvements. The symposium welcomes contributions in all aspects of geodetic reference frames and their applications in Earth science studies\, satellite navigation\, and also other key areas of geomatics and geospatial information systems. The scientific program of the symposium covers all topics related to the activities of IAG Commission 1 and its subgroups\, including also other initiatives and projects which endorse the role of geodetic reference frames towards scientific exploration\, sustainable development\, land administration\, disaster risk reduction and climate monitoring. \nPlease visit the official event website: www.refag2022.org \n\n\nThe GGOS Unified Analysis Workshop (UAW) 2022 is planned to be held in succession of the REFAG2022 symposium in Thessaloniki (at the same venue) during the period October 21-23\, 2022. The UAW is organized under the scientific coordination of IERS and GGOS\, and it is an invited only meeting with the participants being nominated by the IAG services. More details about the UAW 2022 can be found at the workshop’s site. URL:https://geodesy.science/event/refag-2022-symposium/ LOCATION:Electra Palace – Thessaloniki\, Greece\, Aristotelous 9\, Thessaloniki\, Greece CATEGORIES:IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/REFAG2022-thessaloniki.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220914 DTEND;VALUE=DATE:20220917 DTSTAMP:20260405T170207 CREATED:20220113T060602Z LAST-MODIFIED:20250310T120518Z UID:25522-1663113600-1663372799@geodesy.science SUMMARY:Scientific and Fundamental Aspects of GNSS DESCRIPTION:The 8th International Colloquium on Scientific and Fundamental Aspects of GNSS will be held from 14th to 16th September 2022 in Sofia\, Bulgaria. The Colloquium is organised by the European Space Agency (ESA) and University of Sofia St. Kliment Ohridski. \nPlease find more information at the official event portal: \nhttps://atpi.eventsair.com/gnss2022 \nPast Conference Proceedings can be found here. URL:https://geodesy.science/event/scientific-and-fundamental-aspects-of-gnss/ LOCATION:Sofia\, Bulgaria\, Sofia\, Bulgaria CATEGORIES:🌐 Other ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/ScientificFundamentalAspectsGNSS.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220912 DTEND;VALUE=DATE:20220915 DTSTAMP:20260405T170207 CREATED:20220104T074721Z LAST-MODIFIED:20250310T120621Z UID:25519-1662940800-1663199999@geodesy.science SUMMARY:Gravity\, Geoid and Height System 2022 (GGHS2022) DESCRIPTION:The meeting will be a suitable hybrid with mainly in-person and some online components\, as the circumstances allow. \nPlease visit the official website for ongoing updates: https://www.csr.utexas.edu/gghs2022 \n  URL:https://geodesy.science/event/gravity-geoid-and-height-system-2022-gghs2022/ LOCATION:Thomson Conference Center\, 2405 Robert Dedman Dr\, Austin\, TX\, 78712\, United States CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/conference_freepic.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220905 DTEND;VALUE=DATE:20220909 DTSTAMP:20260405T170207 CREATED:20210901T051935Z LAST-MODIFIED:20260210T071135Z UID:25510-1662336000-1662681599@geodesy.science SUMMARY:2nd International Symposium of Commission 4: Positioning and Applications DESCRIPTION:The 2nd International Symposium of Commission 4: Positioning and Applications will take place from 5 to 8 September 2022 at the GFZ Potsdam. \nThe 2nd Commission 4 Symposium brings together scientists\, researchers\, and professionals dealing with the broad area of positioning and applications. For this purpose\, it will facilitate the discussion of research that leverages current and emerging positioning techniques and technologies aiming at delivering both practical and theoretical solutions for engineering and mapping applications\, GNSS-based technologies\, sensor fusion\, and atmospheric remote sensing\, modelling\, and applications\, based on geodetic techniques. Recognizing the central role of Global Navigation Satellite Systems (GNSS) in providing high-accuracy positioning information today and in the future\, the 2nd IAG Commission 4 Symposium will focus on ongoing research for improving models and methods that enhance and ensure the performance of GNSS-based positioning solutions for a wide range of geodetic applications. The 2nd IAG Commission 4 Symposium will be devoted to the discussion of theory\, strategies\, and tools for modelling and/or mitigating the effects of interference\, signal loss\, and atmospheric effects as they apply to precise GNSS and other space geodetic techniques. They will address the technical and institutional issues necessary for developing backups for GNSS\, integrated positioning solutions\, automated processing capabilities\, and quality control measures. Besides positioning\, another focus of the 2nd IAG Commission 4 Symposium will be on remote sensing and modelling of the lower and upper atmosphere. \nThis symposium will be carried out in close cooperation with the International GNSS Service (IGS)\, the IAG Global Geodetic Observing System (GGOS) Focus Area “Geodetic Space Weather Research”\, as well as via linkages with relevant entities within scientific and professional sister organizations. The Symposium will be co-sponsored by the International Association of Geomagnetism and Aeronomy’s (IAGA)\, Division II “Aeronomic Phenomena” Working Group IIC “Meteorological Effects on the Ionosphere”. Further partners are the Institute of Navigation (ION)\, the SGI Workshop Organizers of Technische Universität Berlin\, and the GFZ Potsdam. \nPlease visit the event website to see more information: https://www.iag-commission4-symposium2022.net/ \n  URL:https://geodesy.science/event/2nd-international-symposium-of-commission-4-positioning-and-applications/ LOCATION:GFZ Potsdam\, Telegrafenberg\, Potsdam\, 14473\, Germany CATEGORIES:IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/IAG-commission4-symposium.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220802 DTEND;VALUE=DATE:20220812 DTSTAMP:20260405T170207 CREATED:20210901T063241Z LAST-MODIFIED:20210901T063241Z UID:25513-1659398400-1660262399@geodesy.science SUMMARY:IAU General Assembly 2022 DESCRIPTION:The International Astronomical Union (IAU) was founded in 1919. Its mission is to promote and safeguard the science of astronomy in all its aspects through international cooperation. Its individual members–structured into Divisions\, Commissions\, and Working Groups–are professional astronomers from all over the world\, at the Ph.D. level and beyond\, who are active in professional research and education in astronomy. \nTo learn more about this event\, visit the IAU XXXI General Assembly event page. URL:https://geodesy.science/event/iauga-2022/ LOCATION:Bexco\, Busan\, Republic of Korea\, Busan\, Korea\, Republic of CATEGORIES:🌐 Other ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/IAU-GA-2022_Screen-Shot-2021-07-20-at-10.48.48-AM-2048x506-1.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220716 DTEND;VALUE=DATE:20220725 DTSTAMP:20260405T170207 CREATED:20210901T053750Z LAST-MODIFIED:20210901T053750Z UID:25511-1657929600-1658707199@geodesy.science SUMMARY:COSPAR 2022 DESCRIPTION:The 44th COSPAR Scientific Assembly in Athens\, Greece will be held 16 – 24 July 2022.  Information on the scientific program and other relevant links are available at https://www.cospar-assembly.org/. The Local Organizing Committee (LOC) website\, for information on registration\, accommodation and other matters\, is open at http://www.cosparathens2022.org/. URL:https://geodesy.science/event/cospar-2022/ LOCATION:Athen\, Greece\, Thessaloniki\, Greece CATEGORIES:🌐 Other ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/COSPAR_Symposium2022.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220627 DTEND;VALUE=DATE:20220702 DTSTAMP:20260405T170207 CREATED:20210901T062415Z LAST-MODIFIED:20210901T062415Z UID:25512-1656288000-1656719999@geodesy.science SUMMARY:IGS Workshop 2022 DESCRIPTION:Event: IGS Workshop 2022\nLocation: Boulder\, Colorado USA\nDates: 27 June – 01 July 2022 \nPlease visit the offical event website for more information: https://igs.org/event/igs-workshop-2022/ URL:https://geodesy.science/event/igs-workshop-2022/ LOCATION:Boulder\, Colorado\, USA\, Boulder\, CO\, United States CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/igs-ws2022-event-banner_ws22-home-banner.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220613 DTEND;VALUE=DATE:20220618 DTSTAMP:20260405T170207 CREATED:20220104T080232Z LAST-MODIFIED:20250526T035732Z UID:25520-1655078400-1655510399@geodesy.science SUMMARY:The X Hotine-Marussi Symposium DESCRIPTION:It is a privilege and pleasure to invite you to the jubillee X Hotine-Marussi Symposium on Mathematical Geodesy\, which will be held at Politecnico di Milano\, Italy on June 13-17\, 2022\, under the scientific coordination of the Intercommission Committee on Theory (ICCT) of the International Association of Geodesy (IAG). \nAll details about the symposium\, its scientific program and venue are available at the Hotine-Marussi Symposium 2022 website. \nObjectives\nThe main goals of the Symposium are aligned with the objectives of the ICCT: \n\nadvances in theoretical geodesy\ndevelopments in geodetic modelling and data processing in the light of the recent advances of the geodetic observing systems\nconnections and contribution exchanges between geodesy and other Earth sciences\n\nIn particular\, all the topics regarding the activities of the ICCT Study Groups are of interest and related contributions are strongly encouraged. \nFurther\, also papers concerning other topics related to the possible interaction and mutual benefits between geodetic theory and methodology and other initiatives/projects involving Earth sciences (for example the Group on Earth Observation) are welcome. URL:https://geodesy.science/event/the-x-hotine-marussi-symposium/ LOCATION:Politecnico di Milano\, Milan\, Italy CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/conference_freepic.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220613 DTEND;VALUE=DATE:20220616 DTSTAMP:20260405T170207 CREATED:20220104T073405Z LAST-MODIFIED:20220104T073405Z UID:25518-1655078400-1655337599@geodesy.science SUMMARY:1st Workshop on Data Science for GNSS Remote Sensing DESCRIPTION:There has been recently a rapid progress in Earth observation using GNSS signals from numerous ground and satellite based platforms as well as modern data scientific approaches for their analysis\, including machine learning and data assimilation techniques. We believe it is the right time to gather scientists interested in interdisciplinary activities linking these two research areas to foster a creative and intense scientific exchange and collaborations. Our ultimate goal is the provision of advanced and versatile GNSS Remote Sensing data products on different spatio-temporal scales for Earth System science and related operational applications to advance early warning systems and numerical weather forecasts. \nThis meeting will be hosted by the German Research Centre for Geosciences GFZ and will take place on the historic “Telegrafenberg” in Potsdam on June\, 13-15\, 2022. At the moment\, it is planned as a face-to-face meeting. However\, the organizers carefully observe the pandemic situation and will adapt the meeting format accordingly. \nPlease feel free to visit the workshop website www.D4G-2022.de URL:https://geodesy.science/event/1st-workshop-on-data-science-for-gnss-remote-sensing/ LOCATION:GFZ Potsdam\, Telegrafenberg\, Potsdam\, 14473\, Germany CATEGORIES:IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/workshop-data-science-gnss.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220601 DTEND;VALUE=DATE:20220604 DTSTAMP:20260405T170207 CREATED:20210901T050820Z LAST-MODIFIED:20250526T034320Z UID:25509-1654041600-1654300799@geodesy.science SUMMARY:EUREF Symposium 2022 DESCRIPTION:The EUREF symposium 2022 is planned to take place in Zagreb\, Croatia. \nMore information and the exact dates will follow. Please visit the EUREF website: http://www.euref.eu/euref_symposia.html \n  URL:https://geodesy.science/event/euref-symposium-2022/ LOCATION:Zagreb\, Croatia\, Zagreb\, Croatia (Local Name: Hrvatska) CATEGORIES:IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/euref_logo.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220523 DTEND;VALUE=DATE:20220528 DTSTAMP:20260405T170207 CREATED:20210727T080740Z LAST-MODIFIED:20210727T080740Z UID:25503-1653264000-1653695999@geodesy.science SUMMARY:EGU General Assembly 2022 – GGOS Session DESCRIPTION:GGOS has its own session at the next EGU General Assembly 2022. Be aware\, that the dates of EGU GA 2022 was moved from begin of April to 23-27 May 2022. \nMore information will follow … \n\nThe Global Geodetic Observing System: Geodesy for Science and Society\nThe Global Geodetic Observing System (GGOS) provides measurements of the time varying gravity\, rotation\, and shape of the Earth using space and terrestrial geodetic techniques. These measurements must be accurate to better than a part per billion in order to advance our understanding of the underlying processes responsible for temporal changes in the Earth’s rotation\, gravity\, and shape. Demanding applications of geodesy include mass transport in the global water cycle\, sea level and climate change\, and crustal deformation associated with geohazards. All these measurements require a common reference with the same precision\, like the Terrestrial Reference Frame and the Unified Height System. GGOS is designed to unite the individual observations and model into one consistent frame with the highest precision available to be realized as Global Geodetic Reference Frame (GGRF). This session welcomes contributions on general GGOS topics\, particularly those related to scientific and social aspects of GGOS applications. \nConvener: Kosuke Heki | Co-conveners: Martin Sehnal\, Allison Craddock\, Laura Sanchez\, David Mayer \nhttps://meetingorganizer.copernicus.org/EGU22/session/43044 \n  \n  \n  \n  URL:https://geodesy.science/event/egu-2022-ggos-session/ CATEGORIES:GGOS ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/conference_egu.png END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220523 DTEND;VALUE=DATE:20220526 DTSTAMP:20260405T170207 CREATED:20210901T045558Z LAST-MODIFIED:20250526T034335Z UID:25508-1653264000-1653523199@geodesy.science SUMMARY:Spatial Data: science\, research and technology 2022 DESCRIPTION:Moscow State University of Geodesy and Cartography (MIIGAiK) is holding a unique event in the field of geodesy and cartography in Moscow\, Russia on May 23–25\, 2022: Annual International Scientific Conference “Spatial Data: science\, research and technology 2022”. We would kindly invite you to participate in the conference and the festive events prior to the conference as it is the time for the 243rd Anniversary of MIIGAiK as well. You can find additional information about the event at the link https://web.archive.org/web/20221204153547/https://scidata.ru/en2022 . Aleksei M. Portnov Vice Rector for Scientific and Technical Work MIIGAiK URL:https://geodesy.science/event/spatial-data-science-research-and-technology-2022/ LOCATION:Moscow\, Russia\, Moscow\, Russian Federation CATEGORIES:🌐 Other ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/pexels-valentin-antonucci-1275393.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20220516T003000 DTEND;TZID=UTC:20220516T153000 DTSTAMP:20260405T170207 CREATED:20220222T145404Z LAST-MODIFIED:20260210T071259Z UID:25523-1652661000-1652715000@geodesy.science SUMMARY:GGOS Coordinating Board Meeting 2022 DESCRIPTION:The GGOS CB meeting was held as a virtual 3-hour conference on Monday\, 16 May 2022 (2:30 PM – 5:30 PM CEST). \nParticipants: all GGOS Coordinating Board members + invited guests \nMinutes of GGOS CB Meeting 2022 [PDF] \nSCHEDULE:\nWelcome and Instruction (B. Miyahara) \nShort Reports of GGOS Components: \n[PDF | VIDEO]: Bureau of Products and Standards (D. Angermann) \n[PDF | VIDEO]: Focus Area “Unified Height System” (L. Sanchez) \n[PDF | VIDEO]: Focus Area “Geodetic Space Weather Research” (M. Schmidt) \n[PDF | VIDEO]: Focus Area “Geohazards” (J. LaBrecque) \n[PDF | VIDEO]: External Relations (A. Craddock) \n[PDF | VIDEO]: GGOS Japan (T. Otsubo) \n[PDF | VIDEO]: GGOS Affiliate: D-A-CH (H. Kutterer) \nBreak \nReports of Current Activities: \n[PDF | VIDEO]: GGOS online presence (Website & videos) (M. Sehnal) \n[PDF | VIDEO]: Bureau of Networks and Observations (M. Pearlman) \n[PDF | VIDEO]: GGOS Strategic Planning (B. Miyahara) \n[PDF | VIDEO]: Working Group on “DOIs for Geodetic Data Sets” (K. Elger) \n[PDF | VIDEO]: The UN Global Geodetic Center of Excellence (J. Bouman) \n[PDF | VIDEO]: GGOS Days 2022 (B. Miyahara/ D. Angermann) \nOther Discussion / Any other Business (All) \n  \nFurther Material / videos:\nAll presentation slides are available here: https://cloud.ggos.org/index.php/s/XNeb9RbCnksgZ9k \nAll videos are available at YouTube: https://www.youtube.com/playlist?list=PLIIfsJS7iAuyTQWCcESgc8fG7PNyxuFQg \nGroup Photo:\n \nRecorded Presentations:\nPlease click here to get to the playlist of all presentations. \n\n  \n  \n  URL:https://geodesy.science/event/ggos-cb-meeting-2022/ LOCATION:virtual CATEGORIES:GGOS,IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/ggos_days_conference.png ORGANIZER;CN="GGOS Coordinating Office":MAILTO:co@ggos.org END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220411 DTEND;VALUE=DATE:20220414 DTSTAMP:20260405T170207 CREATED:20220104T080523Z LAST-MODIFIED:20220104T080523Z UID:25521-1649635200-1649894399@geodesy.science SUMMARY:IGRF Workshop DESCRIPTION:More information will follow … URL:https://geodesy.science/event/igrf-workshop/ LOCATION:Leipzig\, Leipzig\, Germany CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/presentation_freepic.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20220321 DTEND;VALUE=DATE:20220324 DTSTAMP:20260405T170207 CREATED:20210901T070831Z LAST-MODIFIED:20210901T070831Z UID:25515-1647820800-1648079999@geodesy.science SUMMARY:IDS Workshop 2022 DESCRIPTION:The IDS workshop 2022 will be held at the Palazzo del Cinema in Venice\, Italy\, from 21 to 23 March 2022\, as part of the altimetry event “Continued\, enhanced ocean altimetry and climate monitoring from space”\, with the Ocean Surface Topography Science Team (OSTST) meeting 2022. \nPlease see more information at the official website: https://ids-doris.org/ids/reports-mails/meeting-presentations/ids-workshop-2022.html URL:https://geodesy.science/event/ids-workshop-2022/ LOCATION:Venice\, Italy\, Venice\, Italy CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/10-vprojectold1-aum-731_stiched-scaled-1.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20211129T080000 DTEND;TZID=UTC:20211201T170000 DTSTAMP:20260405T170207 CREATED:20210831T100708Z LAST-MODIFIED:20250526T034441Z UID:25505-1638172800-1638378000@geodesy.science SUMMARY:SIRGAS Symposium 2021 DESCRIPTION:The National Geographic Institute of Peru and the Executive Committee of SIRGAS\, are pleased to invite the scientific and technological community related to Geodesy and Earth sciences\, to participate in the SIRGAS 2021 Symposium\, which will be held virtually\, between on November 29 and December 1\, 2021. \nPlease find further information here: \nEvent Website \nSIRGAS website \n  URL:https://geodesy.science/event/sirgas-symposium-2021/ LOCATION:virtual CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/sirgas_event.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20211115 DTEND;VALUE=DATE:20211120 DTSTAMP:20260405T170207 CREATED:20210922T103738Z LAST-MODIFIED:20210922T103738Z UID:25517-1636934400-1637366399@geodesy.science SUMMARY:DORIS Days 2021 DESCRIPTION:The IDS is organizing a “DORIS Day” the third week of November 2021. \nThis event is an introductory course to give non-practitioners in DORIS the opportunity to broaden their knowledge on the DORIS technique as well as on the use of the IDS routine products. Several sessions will be given online for up to two hours with a target start time of 13:00 UTC. \n  \nDay 1 – DORIS system\, ground network\, data flow\, products\, analysis \nDay 2 – Software\, systeme performances (POD\, positioning\, EOP)\, missions\, applications \nDay 3 – Network: focus on installation requirements \n  \nPlease find more information and the resgistration form at the official event website: \nhttps://ids-doris.org/ids/reports-mails/meeting-presentations/doris-day-2021.html \n  URL:https://geodesy.science/event/doris-days-2021/ CATEGORIES:IAG ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/IDS-event.jpg END:VEVENT BEGIN:VEVENT DTSTART;VALUE=DATE:20211025 DTEND;VALUE=DATE:20211030 DTSTAMP:20260405T170207 CREATED:20210901T043639Z LAST-MODIFIED:20210901T043639Z UID:25506-1635120000-1635551999@geodesy.science SUMMARY:ILRS Virtual World Tour 2021 DESCRIPTION:This online event will be held October 25–29\, 2021\, to virtually visit 5 SLR stations in 5 days\, stopping at: · Herstmonceux\, UK · Mendeleevo\, Russia · Monument Peak\, USA · Shanghai\, China · Wettzell\, Germany \nEach two-hour session will consist of a tour of the site highlighting instrumentation\, software\, safety\, automation\, operations\, as well as current issues and future plans. These tours include a mixture of pre-recorded and live presentations with an opportunity for questions. On each day a short (30-60 min) special session will be arranged before or after a virtual tour. \nFor more information\, please visit the official event website: https://ilrs.gsfc.nasa.gov/ILRS_Virtual_World_Tour_2021/index.html URL:https://geodesy.science/event/ilrs-virtual-world-tour-2021/ LOCATION:virtual CATEGORIES:IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/ILRS_virtual-world-tour_2021.png END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20211011T130000 DTEND;TZID=UTC:20211013T150000 DTSTAMP:20260405T170207 CREATED:20200911T070926Z LAST-MODIFIED:20260210T071232Z UID:25490-1633957200-1634137200@geodesy.science SUMMARY:GGOS Days 2021 (virtual conference) DESCRIPTION:GGOS Days is the annual meeting of GGOS during which the different components of GGOS meet and report on their activities during the past year and their plans for the coming year. Everyone is encouraged to attend! Due to the uncertain COVID-19 situation\, it was decided that the GGOS Days 2021 will take place again completely as virtual conference. So it was not held as a hybrid meeting in Munich (Germany)\, as originally planned. \nThe GGOS Days 2021 were held on October 11 to 13\, 2021 with a duration of 2 hours each day from 13:00 to 15:00 UTC. \nGGOS Days 2021 Report (PDF) \nWatch the Recording\nThe entire conference was recorded and parts of it are now available at the GGOS You Tube Channel. \n\nDownload Reports and Presentations\nThe GGOS Days report\, Status Reports of GGOS components and all Presentation Slides are available at GGOS Cloud:\n \nParticipants\nMembers of the GGOS Consortium\, GGOS Coordinating Board\, GGOS Bureaus\, GGOS Focus Areas\, GGOS Science Panel\, invited guests and all interested persons were highly welcome to attend this meeting. Over all three days 83 people attended this meeting\, with a maximum of 63 and a minimum of 56 each day. \n\n\n\nName\nCountry\n\n\nBasara Miyahara\nJapan\n\n\nAllison Craddock\nUSA\n\n\nMike Pearlman\nUSA\n\n\nRichard Gross\nUSA\n\n\nMartin Sehnal\nAustria\n\n\nDetlef Angermann\nGermany\n\n\nZuheir Altamimi\nFrance\n\n\nThomas Gruber\nGermany\n\n\nRolf Dach\nSwitzerland\n\n\nSusanne Glaser\nGermany\n\n\nSônia Costa\nBrazil\n\n\nKevin Kelly\nUSA\n\n\nToshimichi Otsubo\nJapan\n\n\nClaudia  Tocho\nArgentina\n\n\nKosuke Heki\nJapan\n\n\nSoudarin Laurent\nFrance\n\n\nJaakko Mäkinen\nFinland\n\n\nMarkku Poutanen\nFinland\n\n\nDaniela Thaller\nGermany\n\n\nSergei Rudenko\nGermany\n\n\nAbel Garcia-Castellano\nSpain\n\n\nMariana Moreira\nPortugal\n\n\nManuela Vasconcelos\nPortugal\n\n\nLaura Isabel Fernández\nArgentina\n\n\nElizabeth Bradshaw\nUK\n\n\nYusuke Yokota\nJapan\n\n\nStanislava Valcheva\nBulgaria\n\n\nHartmut Wziontek\nGermany\n\n\nHarald Schuh\nGermany\n\n\nAndrew Matthews\nUK\n\n\nValente Cuambe\nPortugal\n\n\nMattia Crespi\nItaly\n\n\nMichela Ravanelli\nItaly\n\n\nDiogo Avelar\n\n\n\nZinovy Malkin\nRussia\n\n\nElena Martinez Sanchez\nSpain\n\n\nHansjörg Kutterer\nGermany\n\n\nJohannes Böhm\nAustria\n\n\nChristoph Förste\nGermany\n\n\nEzequiel D. Antokoletz\nArgentina\n\n\nIgnacio Parada\nChile\n\n\nGabriel Guimarães\nBrazil\n\n\nRobert Heinkelmann\nGermany\n\n\nArturo Villiger\nSwitzerland\n\n\nEsther Azcue\nSpain\n\n\nMathis Bloßfeld\nGermany\n\n\nSean Bruinsma\nFrance\n\n\nMaik Thomas\nGermany\n\n\nAxel Rülke\nGermany\n\n\nMarkus Rothacher\nSwitzerland\n\n\nJoão Salmim Ferreira\nPortugal\n\n\nSultan Alshahrani\nSaudi Arabia\n\n\nHelena Ribeiro\nPortugal\n\n\nYoshiyuki Tanaka\nJapan\n\n\nBen Phillips\nUSA\n\n\nChristopher Kotsakis\nGreece\n\n\nRiccardo Barzaghi\nItaly\n\n\nLarry Hothem\nUSA\n\n\nElena Yebes\n\n\n\nJose Antonio Tarrío\nChile\n\n\nMarie-Francoise Lalancette\nFrance\n\n\nEdilberto Suárez Torres\nColombia\n\n\nFuensanta G. Montesinos\nSpain\n\n\nToshiki Kumazawa\n\n\n\nMario Moreno\nGermany\n\n\nPatrick Schreiner\nGermany\n\n\nE. Sinem Ince\nGermany\n\n\nBenjamin Männel\nGermany\n\n\nKirsten Elger\nGermany\n\n\nAssumpció Termens\nSpain\n\n\nRyan Hippenstiel\nUSA\n\n\nSergio Rozas\nChile\n\n\nJuan Quilaleo\nChile\n\n\nGeorgios S. Vergos\nGreece\n\n\nLéo Martire\nUSA\n\n\nDavid Grzan\nUSA\n\n\nKangkang Chen\n\n\n\nAttila Komjathy\nUSA\n\n\nJianliang Huang\nCanada\n\n\nTilo Schöne\nGermany\n\n\nJose Manuel Ferrandiz\nSpain\n\n\nValentino Constantinou\nUSA\n\n\nJohn Rundle\nUSA URL:https://geodesy.science/event/ggos-days-2021/ CATEGORIES:GGOS ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/Logo_GGOSDays_Event-1.png ORGANIZER;CN="GGOS Coordinating Office":MAILTO:co@ggos.org END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20211006T080000 DTEND;TZID=UTC:20211021T170000 DTSTAMP:20260405T170207 CREATED:20210827T081251Z LAST-MODIFIED:20210827T081251Z UID:25504-1633507200-1634835600@geodesy.science SUMMARY:GNSS Interferometric Reflectometry (GNSS-IR) Course DESCRIPTION:Kristine M. Larson gives a short course on GNSS Interferometric Reflectometry (GNSS-IR). It is a half-day and covers basic principles with an overview on the GNSS-IR software package she developed in python. This is followed by two practical sessions\, one on snow depth and the other on measuring water (tides\, lakes\, rivers). The main part of the course is being held on October 21. \nUNAVCO has graciously agreed to support this class\, and registration is via their portal. The deadline for registering is September 3. Here is the link to get more details and to sign up for the class: https://www.unavco.org/event/2021-gnss-interferometric-reflectometry/ \n  URL:https://geodesy.science/event/gnss-interferometric-reflectometry-gnss-ir-course/ LOCATION:virtual CATEGORIES:🌐 Other ATTACH;FMTTYPE=image/jpeg:https://geodesy.science/wp-content/uploads/workshop_freepic.jpg END:VEVENT BEGIN:VEVENT DTSTART;TZID=UTC:20210628T080000 DTEND;TZID=UTC:20210703T170000 DTSTAMP:20260405T170207 CREATED:20200911T065156Z LAST-MODIFIED:20250526T034505Z UID:25489-1624867200-1625331600@geodesy.science SUMMARY:IAG Scientific Assembly 2021 - GGOS Symposium DESCRIPTION:The IAG Scientific Assembly will be held in Beijing on June 28–July 2\, 2021.  The Scientific Assembly is a quadrennial event\, in the middle of the periods of the IAG General Assembly. To view all details\, instructions of deadlines\, schedule\, programme\, abstract submission and registration of this conference\, please visit the official website: www.iag2021.com \nDue to the ongoing COVID-19 pandemic\, the Assembly was organized as a totally virtual meeting. The Assembly papers will be published in the renowned peer-reviewed book series\, International Association of Geodesy Symposia. All papers will be open access\, and publishing will free of charge. There will be eight Symposia\, with topics covering the activities of IAG Commissions\, Services\, Inter-Commission Committees and a timely topic on Geohazards. \nGGOS Symposium\nGGOS organized the Symposium 5 with the title Global Geodetic Observing System (GGOS): the metrological basis for the monitoring of the System Earth. All together 6 sessions will be held in this GGOS Symposium (detailed descriptions). \n\n5.1: Geodetic infrastructure for Earth System Monitoring\n5.2: Gravity observations and networks in the framework of GGOS (Joint with: 2a.1 2b.6 QuGe)\n5.3: Standardized geodetic products for a reliable System Earth observation\n5.4: Geodetic space weather research\n5.5: Assimilation of geodetic observations in the modelling of the Atmosphere\, Cryosphere and Hydrosphere\n5.6: Geodesy contributions to address societal challenges (Joint with: 6.1)\n\nIf you are interested to contribute to this GGOS Symposium in any of theses Sessions\, please submit an abstract until April 30\, 2021. \nMore details about the IAG Scientific Assembly Symosiums… \n  URL:https://geodesy.science/event/iag-scientific-assembly-2021/ CATEGORIES:IAG ATTACH;FMTTYPE=image/png:https://geodesy.science/wp-content/uploads/IAG_ScientificAssembly-1.png END:VEVENT END:VCALENDAR